A stiff neck results from slowed circulation and lymph flow to muscle tissues. Use contrast hydrotherapy—a quick blast of hot, then cold water—to get the blood pumping again. In the shower, first run hot water over your neck for 20 seconds to increase blood flow, then switch to cold for 10 seconds to constrict blood flow. Alternate three times, always ending with cold. When you get out of the shower, your body will send the blood back out to the skin, which results in a final dilation of blood vessels and—voilà!—a looser neck. 
While you may have heard that gargling with apple cider vinegar has a similar effect, you should probably steer clear of this tactic for now, says Dr. Comer. “There is little doubt that apple cider vinegar has antibacterial and possibly antifungal properties in lab studies, but whether or not this translates into helping viral or bacterial sore throats is unknown,” he explains. “Additionally, there are potential significant issues to extended use of vinegar with the tooth enamel—vinegar is acidic, and repeated use can damage tooth enamel.”
This natural sweetener may work just as well for a cough as over-the-counter medicines. That could be especially helpful for children who aren’t old enough to take those. But don’t give it to an infant or a toddler younger than 1. There’s a small risk of a rare but serious kind of food poisoning that could be dangerous for them. And while you may have heard that “local” honey can help with allergies, studies don’t back that up.
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